Combine the two ideas into a single sentence

What percentage of the earth's water is available for use by living things?

Vera is on her school's track and field team. in a practice long-jump competition against her teammates, she gets 5 points for landing over the farther line. she gets a total of 7 jumps and lands x times over the farther line and the rest of the times over the closer line. which of the following functions represents vera's total score? a. f(x)=10x b. f(x)=5x+35 c. f(x)=10x+5 d. f(x)=70-5x

Jerrold has to buy 12 copies of a textbook which costs $36.25 per copy. how much must he spend for them?